Charging base



FIG. 1 is a perspective view of a first embodiment of a charging base showing our new design;

FIG. 2 is a rear view thereof;

FIG. 3 is a front view thereof;

FIG. 4 is a side view thereof;

FIG. 5 is another side view thereof;

FIG. 6 is a top view thereof;

FIG. 7 is a bottom view thereof;

FIG. 8 is a perspective view of a second embodiment thereof, of which the rear, side and bottom views are substantially the same as shown in FIGS. 2-5 and 7; and,

FIG. 9 is a top view thereof. 

CLAIM The ornamental design for a charging base, as shown and described. 